EP2573961B1 - Procédé de blocage de fréquence optique et dispositif pour la transmission de données optiques - Google Patents

Procédé de blocage de fréquence optique et dispositif pour la transmission de données optiques Download PDF

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Publication number
EP2573961B1
EP2573961B1 EP11401589.4A EP11401589A EP2573961B1 EP 2573961 B1 EP2573961 B1 EP 2573961B1 EP 11401589 A EP11401589 A EP 11401589A EP 2573961 B1 EP2573961 B1 EP 2573961B1
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Prior art keywords
optical
frequency
channel
transmit signal
channel transmit
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German (de)
English (en)
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EP2573961A1 (fr
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Michael Eiselt
Markus Roppelt
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Adva Optical Networking SE
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Adva Optical Networking SE
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Priority to US13/610,575 priority patent/US9166695B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H01S5/0687—Stabilising the frequency of the laser
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0797—Monitoring line amplifier or line repeater equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/572—Wavelength control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/0617—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium using memorised or pre-programmed laser characteristics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
    • H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar

Definitions

  • the invention relates to an optical frequency locking method for tuning each of a plurality of narrow-band optical channel transmit signals to a dedicated optical channel frequency, the channel transmit signals having arbitrary channel frequencies within a transmission band spectrum. Further, the invention relates to an optical wavelength-locking device adapted to realize the corresponding method.
  • wavelengths of the optical transmitters need to be locked to dedicated channel wavelengths, for example according to the ITU wavelength grid with optical frequencies spaced by 100, 50, or 25 GHz.
  • wavelength lockers are available using optical filter devices, like etalons, which are periodic with the ITU frequency spacing.
  • the known methods for locking the wavelength or optical frequency of a transmit signal to a dedicated channel frequency use a fixed relative position of the periodical optical transfer function of an optical filter device in order to lock the frequency of the transmitter unit to a fixed position of the respective transmission band of the filter. This fixed position usually corresponds to a mid point between the minimum and the maximum point of the filter transfer characteristic (see e.g. WO 2007/005755 A1 ).
  • optical wavelengths or optical frequencies for the channel transmit signals are required, which do not match the ITU grid.
  • An example of such an application is a data transmission system using a cyclic arrayed waveguide grating (cyclic AWG) for demultiplexing an optical WDM signal comprising optical channel signals lying in one optical band (for example the L-band) and multiplexing channel transmit signals guided in the opposite transmission direction and lying in another optical band (for example the C-band).
  • cyclic AWG cyclic arrayed waveguide grating
  • the cyclic AWG may be used for demultiplexing the WDM receive signal and multiplexing the channel transmit signals into a WDM transmit signal, if the channel receive signals and the channel transmit signals are spaced by a multiple integer of the free spectral range (FSR) of the cyclic AWG, that is, in different refractive orders of the cyclic AWG.
  • FSR free spectral range
  • the frequency spacing in different, even neighboring orders is slightly different, the frequency spacing of the downstream and upstream channels is different, too.
  • the intrinsic frequency spacing of the channel signals for the upstream or downstream direction differs from the ITU spacing by a few GHz, even if the channel signals for the respective other direction match the ITU spacing.
  • wavelength-locking devices for arbitrary but fixed absolute frequencies and arbitrary but fixed frequency spacings are not readily commercially available, or they are prohibitively costly as it is necessary to manufacture optical filter devices having a periodicity matching the required frequency spacing in rather low numbers.
  • optical filter devices having a periodical transfer function, which are tunable with respect to the absolute position of the transmission bands (or peaks) and with respect to the spacing of the bands (or peaks), like a tunable delay-line interferometer.
  • the absolute frequency and the frequency spacing of the transmission bands (or peaks) strongly varies with temperature, so the temperature of such a device needs to be precisely controlled during operation.
  • a control signal having a fixed wavelength or optical frequency may be used to control the frequency grid of the interferometer.
  • both variants require additional effort and costs.
  • EP 2 290 852 A2 describes a wavelength control method and a respective device that enable a highly precise variable control of wavelengths at arbitrary wavelength intervals by using a simple configuration including two cyclic filters, one of the cyclic filters having a fixed transmission wavelength characteristic and the other cyclic filter having a variable transmission wavelength characteristic.
  • changing the transmission characteristic of a cyclic filter during the control process e.g. by controlling the temperature of an etalon, requires additional temperature control means and leads to a rather slow control process.
  • the present invention enables to control off-grid wavelengths or optical frequencies by using at least one on-grid optical filter device, which is available thermally stable and at relatively low costs.
  • on-grid wavelength-locking devices consisting of an optical filter device (like a Fabry-Perot interferometer) and two detector means may be used, in which one detector means (e.g. a photodiode) detects the input optical power of a narrow-band optical channel transmit signal, and the other photodiode (e.g. a photodiode) detects the power of the signal having passed through the Fabry-Perot interferometer (i.e. the filtered optical channel transmit signal).
  • one detector means e.g. a photodiode
  • the other photodiode e.g. a photodiode
  • the ratio of the powers detected by the detector means has a predetermined value.
  • This value of the ratio may be determined (measured or calculated) for each of the dedicated channel frequencies (which may, for example, be the frequencies of the ITU frequency grid), preferably before turning up the transmission system. If this ratio is smaller (larger) than the pre-determined value, the frequency is too low (too high) and needs to be tuned upwards (downwards).
  • this tuning algorithm might be inverted.
  • the channel transmit frequencies of the channel transmit signals reveal channel frequency spacings (i.e. the frequency distance between two neighboring channel transmit signals) which are not all essentially equal to the periodicity of the transfer function of the at least one optical filter device. It lies within the scope of the present invention if at least one channel frequency spacing is different from the periodicity of the at least one filter device. Of course, all channel frequency spacings of the channel transmit signals may be different from the periodicity of the at least one filter device. In a specific embodiment of the invention, the frequency spacings of the channel transmit signals may be essentially identical but different from the periodicity of the transfer function of the at least one optical filter device.
  • the optical frequency of the channel transmit signal is tuned to an initial value lying within said predetermined locking range for the dedicated optical channel frequency.
  • this target ratio is preferably determined before turning up the system. It remains constant for a given type of wavelength-locking device and can either be measured or calculated ahead of time, using the transfer characteristics of the optical filter device and the optical frequency or frequency spectrum of the optical transmitter units.
  • the solution according to the invention utilizes at least two on-grid optical filter devices and at least two detector means for detecting the power of the filtered transmit signals.
  • the same detector means may be used as for detecting the filter input signal of the first optical filter device, even if an optical splitter unit is used to split the transmit signal that is tapped off from the data transmission path into two or three signals (one supplied to the signal input detector means and each of the remaining two signals to the respective one of the two filter devices).
  • the constant factor that takes into account the splitting ratio of the splitter unit can be taken into account when calculating the target ratio.
  • the transfer function of the at least two on-grid optical filter device preferably reveal the same periodicity and are shifted by a predetermined phase shift versus each other. In this way, it can be achieved that, if the target frequency is near the minimum or maximum of the first optical filter device transfer function, the target frequency is on one of the slopes (aside from the minimum or maximum) of the further optical filter device transfer function, so that the further optical filter device (and a respective target ratio for the respective dedicated channel frequency for this further filter device) can be used for the frequency locking.
  • This method achieves a minimum locking range, which is typically larger than a quarter of the filter periodicity.
  • This locking range can further be improved using the same devices, by comparing the ratio of the detected power values after the at least two optical filter devices and comparing this value to a value which would be detected when the signal is at the target frequency.
  • the tuning method is determined (ratio of filter 1, ratio of filter 2, or ratio between filter 1 and filter 2).
  • the predetermined locking range can be defined by determining a first spectral distance between the dedicated channel frequency and a first neighboring point at a lower frequency having the same value of the ratio of the optical output and input signal as the value of the predetermined ratio and determining a second spectral distance between the dedicated channel frequency and a second neighboring point at a higher frequency having the same value of the ratio of the optical output and input signal as the value of the predetermined ratio.
  • the whole range between the first and second neighboring points may be used, or the range between the frequencies defined by the dedicated channel frequency plus and minus the smaller one of the first and second spectral distances.
  • the locking range lies within the range between two neighboring extreme values (maximum and minimum) for the ratio which includes the target value.
  • the selection of the optical filter device to be used for tuning a selected one of the channel transmit signals can be made by determining for all optical filter devices, preferably during a calibration process or by calculation, the locking range (especially according to the two last mentioned alternatives) and using the filter device and the respective input and output signal, respectively, for the locking mechanism that ensures the maximum locking range for the channel transmit signal to be tuned.
  • the optical power of the tapped-off channel transmit signal filtered by a first optical filter device may be monitored as a first optical output signal
  • the optical power of the tapped-off channel transmit signal filtered by a second optical filter device may be monitored as a second optical output signal.
  • the optical frequency of the respective channel transmit signal may then be tuned, within a predetermined locking range, such that a predetermined value of the ratio of the first and second output signals corresponding to the dedicated optical channel frequency is reached.
  • a first spectral distance between the dedicated channel frequency and a first neighboring point at a lower frequency having the same value of the ratio of the first and second optical output signals as the value of the predetermined ratio may be determined as well as a second spectral distance between the dedicated channel frequency and a second neighboring point at a higher frequency having the same value of the ratio of the first and second optical output signals as the value of the predetermined ratio.
  • the whole range between the first and second neighboring points may be used or the range between the frequencies defined by the dedicated channel frequency plus and minus the smaller one of the first and second spectral distances.
  • using the ratio of two output signals for the tuning process is advantageous as a larger locking range is provided as compared to the use of the transfer functions of the at least two filter devices.
  • a plurality of channel transmit signals may be combined within a single WDM transmit signal that is used for tapping off one or more WDM transmit signals in order to monitor the input and output signals, wherein the channel transmit signal to be tuned is amplitude-modulated with a given low modulation frequency (small versus the bitrate) and a given predetermined small modulation depth and wherein the input and output signals are detected in a phase sensitive manner.
  • Fig. 1 shows a part of a complex fiber-optic data transmission system 1 comprising a central node in the form of an optical line terminal OLT, also designated by reference numeral 3, a remote node RN, also designated by reference numeral 5 and a number of N optical node units ONU 1 to ONU N, also designated by reference numerals 7, which may be provided at the customer locations. Further, the system includes an optical frequency locking device 9 that might be included within the OLT 3.
  • the OLT 3 includes an array of N tunable optical transmitter units 11, each being adapted to create an optical channel transmit signal at a given wavelength or optical frequency (due to the narrow optical spectrum of the transmit signals the term "(optical) frequency" will be used throughout the following description).
  • the optical transmitter units 11 are preferably realized as laser diodes.
  • the optical transmit signals created by the optical transmit units lie within a predetermined frequency band, for example the L-band, and reveal, in this embodiment, a given fixed frequency spacing, for example according to the standardized ITU grid (100 GHZ, 50 GHz or 25 GHz, respectively).
  • An optical multiplexing device 13 is provided that receives the optical transmit signals at a respective one of N input ports and multiplexes the channel transmit signals into a WDM transmit signal S WDM,TX , which is output at a multiplex port of the multiplexing device 13.
  • the mulitplexing device may be realized as an AWG.
  • a predefined (small) power portion of the WDM transmit signal is tapped off by an optical 1x2 splitter 15 which lies within the optical path of the WDM transmit signal.
  • One splitting port of the optical splitter 15 is connected to an input port 17 of the optical frequency locking device 9.
  • the other splitting port of the optical splitter 15 is connected to the L-band port of a band splitter 19 which is adapted to combine/separate the optical path for the WDM transmit signal S WDM,TX transmitted from the OLT 3 to the RN 5 and the optical path for a WDM receive signal S WDM,RX created by the ONUs and transmitted from the RN 5 to the OLT 3.
  • the channel signals created by the ONUs lie within another band than the channel transmit signals created by the transmitter units 11 of the OLT 3, for example with the optical C-band.
  • the corresponding channel signals for establishing a bidirectional transmission link between the OLT 3 and a given ONU reveal a frequency spacing being an integer multiple of the free spectral range of a cyclic AWG included within the RN 5.
  • a single cyclic AWG may be used as multiplexing/demultiplexing device for demultiplexing the WDM transmit signal S WDM,TX and for multiplexing the channel signals created by the ONUs, which are received at dedicated multiplexing ports of the cyclic AWG into the WDM receive signal S WDM,RX , which is output at a multiplex port of the cyclic AWG, which is connected to a common port of the band splitter 19 included within the OLT 3.
  • the band splitter 3 outputs the WDM receive signal S WDM,RX at a C-band port which is connected to the multiplex port of a further AWG 21 having N demultiplex ports, each being connected to a receiver unit 23.
  • the receiver units 23 may be realized as an array of receiver units.
  • the frequency spacing of transmission bands in the fundamental and higher refractive orders deviate from each other to a given extent.
  • a cyclic AWG is used having a frequency spacing of 100 GHZ between the transmission bands of the fundamental refractive order (or a given order N) and a frequency spacing of 97.5 GHZ in the first refractive order (or a given neighbouring order N+1).
  • the fundamental refractive order (or the order N) may be used for multiplexing the channel signals created by the ONUs which shall be assumed to be spaced apart by 100 GHz.
  • the tapped-off power portion of the WDM transmit signal S WDM,TX is supplied to the input port 17 of the frequency locking device 9, which comprises at least one optical filter device 25 having a periodical filter transfer function with a fixed, constant frequency spacing.
  • Such filter devices are only readily available at reasonably low costs for frequency spacings as defined by the respective ITU standards, as only such filter devices are produced in high numbers.
  • an optical filter device 25 having a frequency spacing off the grid that is requested for the optical transmit channel signals may be used in order to enable frequency locking, that is, tuning the transmitter units 11 such that the optical frequencies of the signals match the dedicated channel frequencies.
  • Fig. 2 shows the normalized filter transfer function (curve (a)) for an optical filter device 25, for example a Fabry-Perot filter or Etalon, having a periodicity of 100 GHz.
  • the filter transfer function is defined by the ratio of the optical power of the filter output signal and the filter input signal.
  • the points 27 mark the points of the transfer function at the dedicated channel frequencies defined by the grid of the first refractive order of the cyclic AWG having a frequency spacing of 97.5 GHz. As this frequency spacing is different from the periodicity of the filter transfer function, the points 27 do not lie on a line parallel to the frequency axis but on the curve (b) connecting the points (this curve may be calculated using a nonlinear interpolation method).
  • the transfer function may thus be used to calculate, for each of the dedicated channel frequencies that are to be matched by the channel transmit signals, a value of the transfer function, i.e., a (target) ratio of the filter output signal and the filter input signal. For calculating this value, the spectrum of the respective transmit signal may be taken into account. For simplicity, the spectral broadness of the transmit signal may (at least for narrow-band signals) be neglected and the respective point of the (calculated) transfer function may be used as a target ratio for controlling the respective transmitter unit such that the optical frequency of the transmitter unit is tuned to a value at which the target ratio is reached exactly or at least with a sufficient accuracy.
  • curve (a) may also be replaced by a measured curve using a tunable transmit unit that may be tuned over the whole interesting range.
  • an optical reference detector 29 of the optical frequency locking device 9 detecting a pre-determined portion of the optical power of the tapped-off channel transmit signal received at the input port 17 and a further optical detector 31 comprised within the optical frequency locking device 9 detecting a given power portion of the optical transmit signal supplied to and filtered by the optical filter device 25 may be used.
  • the channel transmit signal received at port 17 of the locking device 9 is split into three signals, preferably having equal power portions, two of which are supplied to the optical filter device 25 and a further optical filter device 26.
  • an optical 1 x3 splitter (not shown) or any other splitter means providing the desired signal splitting (like cascaded 1 x2 couplers) may be used.
  • the splitting ratio is constant and essentially wavelength-independent over the interesting range, the ratio of the input and output signal (which equals the corresponding value of the transfer function, if a narrow-band signal is used) merely has to take into account this constant factor.
  • the embodiment of an optical frequency locking device shown in Fig. 1 uses, as mentioned above, two optical filter devices 25, 26.
  • the optical power of the filtered signal output by the filter device 25 is detected by the optical detector 31, and the optical power of the filtered signal output by the filter device 26 is detected by a further optical detector 32.
  • All optical detectors 29, 31, 32 may comprise a broad-band photodiode.
  • Each optical detector 29, 31, 32 creates an electrical signal that is supplied to a controller device 33.
  • the controller device 33 is adapted to receive and process the detector signals. It calculates the ratios of the actual values of the output signals and input signals for each of the optical filter devices used for the tuning of the transmitter units 11.
  • the controller unit 31 may further comprise a storage (not shown) for storing the target ratios of the output and input signals for each optical filter device 25, 26.
  • the controller device 33 creates a frequency control signal S f for controlling the respective transmitter unit 11 according to a given tuning algorithm. Suitable tuning algorithms are well-known and shall not be further discussed within this description.
  • Fig. 3 shows, for a smaller number of channels, the transfer function of the optical filter device 25 (curve (a)) and the transfer function of the optical filter device 26 (curve (c)).
  • the target ratios for the dedicated channel frequencies are shown by respective points 27 and 28.
  • the triangles left and right of a point 27, 28 designate the directly neighboring points of the respective transfer function (a), (c) having the same value as the respective point or target value.
  • the target value is unique and may thus be reached by using a suitable tuning algorithm.
  • the smaller frequency spacing of the spacings between the points 27, 28 and each of the respective point marked by the triangles may be used to define a symmetric locking range by adding and subtracting the smaller absolute value of the two distances to and from the frequency of the respective target point (i.e. the respective dedicated channel frequency).
  • the locking range defined in this way becomes small within the neighborhood of the extreme values (and may even be zero, if the target value is the extreme value) and is large within a given range between the extreme values.
  • the transfer functions (a) and (c) of the filter devices 25, 26 reveal an identical periodicity but are shifted versus each other by 1 ⁇ 4 of the frequency spacing or 25 GHz. In this way, it is achieved that, if a target ratio for a given channel frequency is near an extreme value of one of the transfer functions and thus a small locking range can be provided, only, the target ratio for the same channel frequency on the other transfer function lies within a range that provides a rather large locking range.
  • Fig. 4 shows how this effect can be used to determine, for each channel frequency, which of the two filter devices 25, 26 should be used in order to provide the larger locking range (as determined according to the method described above).
  • the x-coordinate of the diagram in Fig. 4 represents the channel number of 50 channels spaced apart by 97.5 GHz and the y-coordinate represent the locking range in GHz.
  • the zigzag curve (d) connects all points representing the locking range for the 50 channels provided by using the filter device 25 or the transfer function (a), respectively, and the zigzag curve (e) connects all points representing the locking range for the 50 channels provided by using the filter device 26 or the transfer function (c), respectively.
  • the points 35 designate the best locking range, either provided by the filter device 25 or the filter device 26 for the 50 channels (or dedicated channel frequencies).
  • the controller device 35 uses the values supplied by the detectors 31 and 29 for creating the frequency control or tuning signal S f , whereas, if the filter device 26 is to be used for the tuning process, the controller device 35 uses the values supplied by the detectors 32 and 29 for creating the tuning signal S f .
  • the controller device 35 must know which of the two filter devices 25, 26, together with the respective stored target ratio, is to be used for the tuning process and in which direction the frequency must be tuned if the measured ratio deviates up or down from the target ratio.
  • this transmitter unit may be active, so that the respective transmit signal, only, is supplied to the optical frequency locking device.
  • One transmitter unit after the other may be tuned and then switched off until all transmitters are tuned to the desired dedicated channel frequency.
  • this tuning method would not allow to tune the transmitters 11 during operation.
  • the respective channel transmit signal created by the transmitter unit 11 to be tuned may be amplitude-modulated with a given low modulation depth and a rather low modulation frequency (as compared to the bit rate of the digital data transmission signal).
  • the controller device 35 may then apply a phase sensitive filter process to the signals supplied by the detectors 29, 31, 32. In this way, the other channel transmit signals included within the tapped-off WDM transmit signal are filtered out from the detected signals.
  • the embodiment according to Fig. 1 may be simplified by using a single optical filter device and two optical detectors, only.
  • optical filter devices each having a periodical transfer function that is off-grid as compared to the dedicated channel frequencies and all transfer functions being shifted versus each other by a predetermined frequency shift.
  • an additional optical detector for detecting the filtered channel transmit signal may be provided for each further optical filter device.
  • the controller device may calculate the ratio P out1 /P out2 (or the reciprocal value) and store, for each of the dedicated optical channel frequencies of the channel transmit signal, a target ratio k. It is thus also possible to use the ratio P out1 /P out2 or the ratio RTF, respectively, for tuning the frequency of the optical transmitter units 11 to match the respective dedicated channel frequency.
  • the locking range for each of the dedicated channel frequencies may be determined in the same way as described above in connection with the use of a single or more transfer functions of the optical filter devices. That means, the directly neighboring points of the ratio RTF having the same value as a given target value k for a given dedicated channel frequency are determined and the smaller frequency distance between the neighboring points and the given point (on the curve RTF as a function of the (normalized) optical frequency) is used to define a symmetrical locking range with the dedicated channel frequency as center of the locking range.
  • the locking range that is determined using the ratio RTF may be larger than the locking ranges that are determined in the same way using each of the two transfer functions.
  • the ratio RTF (or P out1 /P out2 , respectively) may thus be used to further improve the tuning method.
  • the two or more transfer functions of the two or more optical filter devices are used in order to determine the respective locking ranges.
  • the ratio RTF (or P out1 /P out2 , respectively) may be used to determine a further locking range.
  • Fig. 6 illustrates, for a locking device according to Fig. 1 , in which two filter devices 25 are used having an identical spectral periodicity of 100 GHz but revealing a frequency shift of 19 GHz, how the ratio of the optical powers of the two filtered signals may advantageously be used for the tuning method.
  • the dotted curve in Fig. 6 shows the single side tuning range (determined as described above) for the ratio of the two filtered (output) signals.
  • the locking range between approx. 30 GHz and 50 GHz and between approx. 85 GHz and 95 GHz provided by evaluating the ratio of the two output signals is larger than the locking ranges provided by the respective transfer functions of the two filter devices 25, 26.

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Claims (13)

  1. Procédé de verrouillage de fréquence optique pour syntoniser chacun d'une pluralité de signaux de transmission de canal optique à bande étroite sur une fréquence de canal optique dédiée, les signaux de transmission de canal présentant des espacements de fréquence de canal arbitraires, le procédé comprenant, pour chaque signal de transmission de canal, les étapes ci-dessous consistant à :
    (a) prélever une partie de la puissance optique du signal de transmission de canal devant être syntonisé, et filtrer le signal de transmission de canal prélevé en utilisant au moins un dispositif de filtre optique (25) présentant une fonction de transfert périodique, au moins l'un des espacements de fréquence de canal des signaux de transmission de canal n'étant pas égal à la périodicité de la fonction de transfert ;
    (b) surveiller, sous la forme d'un signal d'entrée optique, la puissance optique du signal de transmission de canal fourni audit au moins un dispositif de filtre optique (25) et, sous la forme d'un signal de sortie optique, la puissance optique du signal de transmission de canal filtré ; et
    (c) syntoniser, dans une plage de verrouillage prédéterminée pour la fréquence de canal optique dédiée, la fréquence optique du signal de transmission de canal respectif de sorte qu'une valeur prédéterminée pour le rapport du signal de sortie et du signal d'entrée correspondant à la fréquence de canal optique dédiée (rapport cible) est atteinte ;
    le procédé étant caractérisé en ce que
    (d) au moins deux dispositifs de filtre optique (25, 26) sont utilisés, chaque dispositif présentant une fonction de transfert périodique, au moins l'un des espacements de fréquence de canal des signaux de transmission de canal n'étant pas égal à la périodicité de chacune des fonctions de transfert, et les fonctions de transfert étant mutuellement différentes ;
    (e) une partie prélevée de la puissance optique du signal de transmission de canal devant être syntonisé est fournie à chaque dispositif desdits au moins deux dispositifs de filtre optique (25, 26), le signal de transmission de canal respectif prélevé étant filtré par le dispositif de filtre optique correspondant (25, 26) ;
    (f) la puissance optique du signal de transmission de canal prélevé fourni à l'un sélectionné des dispositifs de filtre optique (25, 26) est surveillée sous la forme d'un signal d'entrée optique et la puissance optique du signal de transmission de canal respectif filtré par le dispositif de filtre optique sélectionné (25, 26) est surveillée sous la forme d'un signal de sortie optique, et la fréquence optique du signal de transmission de canal respectif est syntonisée, dans une plage de verrouillage prédéterminée, de sorte qu'une valeur prédéterminée du rapport du signal de sortie et du signal d'entrée pour le dispositif de filtre optique sélectionné correspondant à la fréquence de canal optique dédiée est atteinte ; ou
    (g) la puissance optique du signal de transmission de canal prélevé filtré par un premier dispositif de filtre optique (25) est surveillée sous la forme d'un premier signal de sortie optique et la puissance optique du signal de transmission de canal prélevé filtré par un second dispositif de filtre optique (26) est surveillée sous la forme d'un second signal de sortie optique, et la fréquence optique du signal de transmission de canal respectif est syntonisée, dans une plage de verrouillage prédéterminée, de sorte qu'une valeur prédéterminée du rapport des premier et second signaux de sortie correspondant à la fréquence de canal optique dédiée est atteinte.
  2. Procédé selon la revendication 1, dans lequel la valeur prédéterminée du rapport et/ou de la plage de verrouillage est soit calculée en utilisant la fonction de transfert du dispositif de filtre optique (25, 26) et le spectre de fréquence du signal de transmission à la fréquence de canal dédiée, soit mesurée, lors d'un processus d'étalonnage, en utilisant le dispositif de filtre optique (25, 26) et le signal de transmission de canal syntonisé sur la fréquence de canal dédiée.
  3. Procédé selon la revendication 1 ou 2, dans lequel la plage de verrouillage prédéterminée est définie :
    (a) en déterminant une première distance spectrale entre la fréquence de canal dédiée et un premier point voisin à une fréquence inférieure présentant la même valeur du rapport du signal de sortie et d'entrée optique que la valeur du rapport prédéterminé, et en déterminant une seconde distance spectrale entre la fréquence de canal dédiée et un second point voisin à une fréquence supérieure présentant la même valeur du rapport du signal de sortie et d'entrée optique que la valeur du rapport prédéterminé ; et
    (b) en utilisant en tant que plage de verrouillage
    (i) la plage entière entre les premier et second points voisins ; ou
    (ii) la plage entre les fréquences définies par la fréquence de canal dédiée plus et moins la plus petite des première et seconde distances spectrales.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel les fonctions de transfert périodique desdits au moins deux dispositifs de filtre optique (25, 26) présentent essentiellement la même périodicité et sont mutuellement décalées par un décalage de fréquence prédéterminé.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel la sélection du dispositif de filtre optique (25, 26) devant être utilisé en vue de syntoniser l'un sélectionné des signaux de transmission de canal dans la première alternative selon les caractéristiques (d) à (f) de la revendication 1 est réalisée en déterminant, pour tous les dispositifs de filtre optique (25, 26), de préférence au cours d'un processus d'étalonnage ou par un calcul, la plage de verrouillage selon la revendication 3, alternative (b) (ii) et en utilisant le dispositif de filtre et les signaux d'entrée et de sortie respectifs, respectivement, garantissant la plage de verrouillage maximale pour le signal de transmission de canal devant être syntonisé.
  6. Procédé selon les revendications 1 et 5, dans lequel la plage de verrouillage prédéterminée dans la seconde alternative selon les caractéristiques (d), (e) et (g) de la revendication 1 est définie :
    (a) en déterminant une première distance spectrale entre la fréquence de canal dédiée et un premier point voisin à une fréquence inférieure présentant la même valeur du rapport des premier et second signaux de sortie optique que la valeur du rapport prédéterminé, et en déterminant une seconde distance spectrale entre la fréquence de canal dédiée et un second point voisin à une fréquence supérieure présentant la même valeur du rapport des premier et second signaux de sortie optique que la valeur du rapport prédéterminé ; et
    (b) en utilisant en tant que plage de verrouillage
    (i) la plage entière entre les premier et second points voisins ; ou
    (ii) la plage entre les fréquences définies par la fréquence de canal dédiée plus et moins la plus petite des première et seconde distances spectrales.
  7. Dispositif de verrouillage de fréquence optique pour syntoniser chacun d'une pluralité de signaux de transmission de canal optique à bande étroite sur une fréquence de canal optique dédiée, les signaux de transmission de canal présentant des espacements de fréquence de canal arbitraires, le dispositif (9) comprenant :
    (a) au moins un dispositif de filtre optique (25, 26) présentant une fonction de transfert périodique, au moins l'un des espacements de fréquence de canal des signaux de transmission de canal n'étant pas égal à la périodicité de chacune des fonctions de transfert ;
    (b) un moyen (15) apte à prélever une partie de puissance du signal de transmission de canal devant être syntonisé et à fournir le signal de transmission de canal prélevé audit au moins un dispositif de filtre optique (25, 26) ;
    (c) un premier moyen de détecteur (29) apte à détecter, en tant qu'un signal d'entrée, des valeurs absolues ou relatives de la puissance optique du signal de transmission de canal fourni audit au moins un dispositif de filtre optique (25, 26), et au moins un second moyen de détecteur (31, 32) apte à détecter, en tant qu'un signal de sortie, des valeurs absolues ou relatives de la puissance optique du signal de transmission de canal filtré par ledit au moins un dispositif de filtre optique (25, 26) ;
    (d) un dispositif contrôleur (33) apte à recevoir, en provenance des premier et second moyens de détecteur (29, 31, 32), les valeurs détectées des signaux d'entrée et de sortie, et à créer, pour une unité d'émetteur optique (11) créant le signal de transmission de canal, un signal de syntonisation, de sorte que la fréquence optique du signal de transmission de canal est syntonisée sur une valeur à laquelle une valeur prédéterminée pour le rapport du signal de sortie et du signal d'entrée correspondant à la fréquence de canal optique dédiée (rapport cible) est atteinte ;
    le dispositif (9) étant caractérisé en ce que
    (e) au moins deux dispositifs optiques (25, 26) sont fournis, chacun présentant une fonction de transfert périodique, au moins l'un des espacements de fréquence de canal des signaux de transmission de canal n'étant pas égal à la périodicité des fonctions de transfert, et les fonctions de transfert étant mutuellement différentes ;
    (f) le moyen de séparateur optique est apte à séparer le signal de transmission de canal prélevé en le premier signal de transmission de canal fourni au premier moyen de détecteur (29), et en au moins deux seconds signaux de transmission de canal qui sont chacun fournis à un dispositif respectif desdits au moins deux dispositifs de filtre optique (25, 26) ;
    (g) au moins deux seconds moyens de détecteur (31, 32) sont fournis, chacun étant apte à détecter, en tant qu'un signal de sortie, des valeurs absolues ou relatives de la puissance optique du signal de transmission de canal filtré par un dispositif respectif desdits au moins deux dispositifs de filtre optique (25, 26) ;
    (h) le dispositif contrôleur (33) sélectionne, selon des informations stockées, calculées ou reçues, pour une fréquence de canal optique dédiée donnée, lequel desdits au moins deux dispositifs de filtre optique (25, 26) et lequel parmi des signaux d'entrée et de sortie doivent être utilisés pour syntoniser l'unité d'émetteur respective (11) ; et
    (i) le dispositif contrôleur (33) est apte à créer le signal de syntonisation pour l'unité d'émetteur optique respective (11), de sorte que la fréquence optique du signal de transmission de canal est syntonisée sur une valeur à laquelle une valeur prédéterminée pour le rapport du signal de sortie et du signal d'entrée correspondant à la fréquence de canal optique dédiée (rapport cible) est atteinte.
  8. Dispositif de verrouillage de fréquence selon la revendication 7, dans lequel le dispositif contrôleur (33) est apte à commander le processus de syntonisation de sorte que, au début d'un processus de syntonisation, la fréquence optique du signal de transmission de canal est syntonisée sur une valeur initiale située dans ladite plage de verrouillage pour la fréquence de canal optique dédiée.
  9. Dispositif de verrouillage de fréquence selon l'une quelconque des revendications 7 ou 8, dans lequel le premier moyen de détecteur (29) comprend un moyen de séparateur optique apte à séparer le signal de transmission de canal prélevé en un premier signal de transmission de canal fourni à une unité de détecteur de signal d'entrée et en au moins un second signal de transmission de canal fourni audit au moins un dispositif de filtre optique (25, 26).
  10. Dispositif de verrouillage de fréquence selon l'une quelconque des revendications 7 à 9, dans lequel la valeur prédéterminée pour le rapport et/ou la plage de verrouillage pour chaque fréquence de canal dédiée et chaque dispositif dudit au moins un dispositif de filtre optique est stockée dans le dispositif contrôleur (33), ou dans lequel le dispositif contrôleur (33) calcule ces valeurs sur la base d'informations stockées concernant la fonction de transfert dudit au moins un dispositif de filtre optique (25, 26).
  11. Dispositif de verrouillage de fréquence selon la revendication 10, dans lequel le dispositif contrôleur (33) décide, selon des informations stockées, calculées ou reçues, pour une fréquence de canal optique dédiée donnée, qu'au lieu de l'un sélectionné des rapports des signaux de sortie et d'entrée des deux dispositifs de filtre optique (25, 26), le rapport d'un premier signal de sortie et d'un second signal de sortie soit utilisé en vue de syntoniser l'unité d'émetteur respective (11).
  12. Dispositif de verrouillage de fréquence selon l'une quelconque des revendications 7 à 11, dans lequel les fonctions de transfert périodique desdits au moins deux dispositifs de filtre optique (25, 26) présentent essentiellement la même périodicité et sont mutuellement décalées d'un décalage de fréquence prédéterminé, le décalage de fréquence se situant de préférence dans une plage de 15 à 35 pour cent de l'espacement de canal, et correspondant en particulier à 25 pour cent de l'espacement de canal.
  13. Dispositif de verrouillage de fréquence selon l'une quelconque des revendications 7 à 12, dans lequel le signal de transmission de canal prélevé est inclus dans un signal de transmission WDM (SWDM, TX), dans lequel un moyen apte à mettre en oeuvre une modulation d'amplitude du signal de transmission de canal devant être syntonisé avec une fréquence de modulation donnée prédéterminée et une faible profondeur de modulation donnée est fourni, et dans lequel les premier et second dispositifs de détecteur (26 ; 31, 32) sont aptes à détecter le signal de transmission de canal devant être syntonisé et le signal de transmission de canal filtré d'une manière sensible à la phase.
EP11401589.4A 2011-09-12 2011-09-12 Procédé de blocage de fréquence optique et dispositif pour la transmission de données optiques Active EP2573961B1 (fr)

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US13/610,575 US9166695B2 (en) 2011-09-12 2012-09-11 Optical frequency locking method and device for optical data transmission

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